Directing against the problem of somewhat higher exhaust steam pressure in low-pressure cylinder of imported type 300 MW steam turbine

optimization retrofit has been carried out for its low-pressure exhaust steam passage.A flow-equilibrating device is added to the throat of condenser

making the distribution of its outlet steam velocity to be reasonable

improving the thermal load distribution of condenser’s cooling tube bundle

enhancing the heat transfer coefficient.Practical operation and test show that the exhaust steam pressure has lowered more than 0.5 kPa

the cycle efficiency has enhanced 0.6%

the corresponding output power has increased 0.3%

at the same time

the service life of throat-supporting pipe and upper level cooling tubes can be lengthened

the optimization retrofit of exhaust steam passage has obtained comparatively obvious effectiveness.